But you cant just throw a ton more hp into a machine. Its been manufactured to a spec, stick more power in it and itll quickly damage itself. No different to a car, more hp, stronger drivetrain needed, so either heavier, or more expensive. 35hp is plenty for a 6inch machine, but in my opinion 25 is not enough.
Timberwolf are not offering the 35horse diesel in the 230 anymore, I believe due to emmisions, so you take your choice based on whats available. I ended up going 230, because I think the 280 is too wide for the type of work I anticipate. Otherwise I would have gone with an 8inch.